In theory it should be possible to tune the servotronic to be weighted just how you like, anywhere between broken and max assist. Its just a PWM signal on the solenoid, with a ratio of speed to pulse width controlled by the module. Either fiddle with the speed signal in to the module, or drive the PWM directly with something like an Arduino and you can have whatever configuration you like.
If it was just one of the pressure lines failed on your servotronic rack thats a pretty simple fix using stainless braided hose and banjo fittings. HEL (who are 6 miles from me and do stainless brake lines) could make those up easily enough, then you could reinstate the servotronic with custom settings. I have three D2s with servotronic now so its something I want to investigate.
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